170 ON THE SOLITARY CORALS, COLLECTED BY DR A. WILLEY. 



but the perforations of the theca are rather large and arranged in lines between the 

 septa so that the edges of the latter are quite distinct, although nowhere projecting 

 outside the thecal structures. 



The calice is slightly oval in outline with a very deep elongated axial fossa ; its 

 edge has rather a ragged appearance from the sbghtly exsert septa. The septa are 

 thick with narrow interseptal loculi ; they are slightly perforated, and have their sides 

 covered with small granular spines, which may form striae ; their edges are bluntly 

 lobed. They are arranged in six systems and four cycles, which gradually decrease 

 in size. The quaternaries are incomplete, in some systems only two, viz. those on 

 each side of one of the tertiaries, being present. The primaries and secondaries and 

 the tertiaries also, if quaternaries are present, fuse with the columella, which is small, 

 rather elongate in shape and formed of twisted lamellae, which may have one or two 

 papilliform projections. 



Extreme height of the largest specimen, 9"5 mm. Long diameter of the same, 

 5 - 5 mm.; short diameter, 4'3 mm. 



Loc. Sandal Ba}', Lifu ; 40 fathoms. Two specimens. 



This species differs from all previously described forms in the marked distinctness 

 of its cycles of septa and in the secondaries and tertiaries being always larger than 

 the quaternaries. 



Zoological Laboratory, Cambridge. 

 Aug. 9, 1898. 



